Unraveling exciton-phonon coupling in individual FAPbI₃ nanocrystals emitting near-infrared single photons.

ABSTRACT: Formamidinium lead iodide (FAPbI₃) exhibits the narrowest bandgap energy among lead halide perovskites, thus playing a pivotal role for the development of photovoltaics and near-infrared classical or quantum light sources. Here, we unveil the fundamental properties of FAPbI₃ by spectroscopic investigations of nanocrystals of this material at the single-particle level. We show that these nanocrystals deliver near-infrared single photons suitable for quantum communication. Moreover, the low temperature photoluminescence spectra of FAPbI₃ nanocrystals reveal the optical phonon modes responsible for the emission line broadening with temperature and a vanishing exciton-acoustic phonon interaction in these soft materials. The photoluminescence decays are governed

SUBMITTER: Fu M 

PROVIDER: S-EPMC6102301 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature